Push-switch.



H. G. HBLLIVIAN.

PUSH SWITCH. ArmcATloN FILED MAY11,1912..RENEWED sEPT.11.19s6.

l ,2l 89401, Patented Mar. 6, 1917.

lll/71.7

I l K State'of New York, v

-useful Improvement-s in Push-Switches, of

HENRY G. HILLMAN, NEW YORK,

PUSH-SWITCH.

Leijsgeoa.

'appncatiozi alec May 11, i912, serial No'. 696,555.

'To all t may concern.'v

Be it'known that L HENRY' Gr. Humain,- a citizen of the United States,`residing at New' York,in the county of New York and have invented new andl which the following ils a specification.

My inventionrelates to electric and particularly'to'that type designed and used in connection with relatively powerful currents as distinguished from weak current switches used, for instance, in electric bell and alarm circuits, although some .of the features of my switch are also applicable to this latter class of switches.

,The principal objects of the invention are to provide a switch which is strong and posiv tive in its action; in which the contacts have a straight-edge and long -to obviate the effects of arcing;

sliding engagement in which the inclosing case i-sprotected from any arc formed at the contacts; and which may be although substantially manufac- 'The invention resides in the novel con struction and arrangement of parts' of a switch hereinafter described, and illustrated in the accompanying drawings, in which-F Figure .L is a top plan view of the switch complete; Fig. 2 is 'a similar view of the Y operative partsthe cover and base-plate be- Same.

Fig. 3 is an inverted plan view of the same;v Fig. i is a centiul longitudinal section through the complete switch; and Fig: 5 is a centraltransverse section of. the

ing removed;

Referring to the drawings, 1 represents a base plate and 2 the cover for the switch parts, suitably secured to said base plate.

3 is abody block preferably of porcelain orv other suitable insulating material, this body block having centrally located lateral extensions f1 and 5 which rest upon the base plate 1. The bodyfblock may be secured to the base plate i any suitable manner, as by means of screw Lb lts 6f of which one only is shown.v

Located in the central chamber; in said body block is a push rold comprising a shank 7 and a push part or button Shaving a screw F thri'eac'iv connection therewith. Secur d to the lower vend ofthe shankf'? .is a c` itact plate 9 'which is preferably rectangular in formt-and lies betweenextensions 4; and 5 of Specification of Letters Patent.

switches,

Patented Mar. 6, 191?. Renewed lSeptenilmer 11, 1916. Serial No. 119,606.

vsaid body block. This contact plate 9 has n. Y., assieuon To :onu raam: CLARKE, er new K YORK, N. v. l l

straight edges 10 and 11 for engagement y with contact springs. Shank 7 of the -push rod extends through a perforation in the end of said central chamber, as shown in Fig. 4, and between the push part 8, and this end wall of said chamber is located a compression spring 12.

Upon each side of said central chamber the body block is provided with'apertures 13, 14, in which are mounted contact springs 15 and 16 which bear respectively straight edges of the contact plate 9. The

upon the contact springs are secured to the body block by screws 17 which pass through holding blocks The terminal wires 19 and 20'are secured b y screws 21 and 22 which vpass upwardly through the body block and engage the holding blocks 18 respectively. 1

It will be understood from the description that the coiled spring 12 normally holds contact plate 9 against the body block and in engagement with springs 15 and 16. When push part 8 is pressed inwardly contact plate 9 is moved away from the body block and slides along springs 15, 1G until it is disengaged therefrom7 then moving farther so as to make a wide break, the springs then-resting against the body block. The side extensions et and 5 of the body block, these sides forming the I support for the block by resting upon base lplate 1, serve to prevent the turning of the Contact plate 9v block, means for maintaining the lcontact relation to the Contact s55 plate in its proper' springs, and as arc shields for the contacts. It will be seen that the straight edges 10 and 11 form an efcient contact with eachof the springs, and by having a long sliding engagement therewith both springsvand edges are kept bright and free from. deposit or oxidation caused by arcing.

It is obvious that many changes may be made in the details of my switch without departing from the invention. the switch is shown to be normally closed and arranged to open the circuit when operated, but itis obvious that by changing 'the shape or length of the-contact springs,

18 overlying the spring ends.

foregoing v For instance;l

or otherwise alim-n ming 131g des@ with said, springs? and. a lauf de @i w bdy block ofmed with a pair of apwwnu oppostey arranged, @unime-t springs Mael .A indy Mock. Q extending iuo said apart-mes, L i mow/ab bwl @in which said bridging Contact plate mounted bewen sing body bock am said springs und having edges in S'dng QL paa Splngs, means fm moving sui@ commet out of engafemen't wfl and a lateral extension of u omad on each sde o i1 tact is prevent h@ same Q ci tw@ summum 

